| 摘要 |
PURPOSE:To manufacture the titled optical fiber having high symmetricity, excellent polarization-maintaining characteristics, and low loss, by forming a hole to a porous matrix composed of a core and a clad, making the matrix transparent with heat, inserting a glass rod into the hole, and drawing the assembly. CONSTITUTION:A raw material which makes glass by reaction is subjected to e.g. flame hydrolysis reaction, etc., and the formed fine glass particles are deposited to the end or the circumference of a seed rod made of e.g. quartz glass to obtain a matrix composed of porous core 10 and clad 11. A part of the matrix is removed e.g. by an optical means using laser light to form a hole 13 corresponding to stress-imparting part. The matrix is made transparent by heating e.g. with an electric furnace, etc., optionally in combination with dehydration treatment, and a glass rod 18 having different thermal expansion coefficient from that of the clad 11 is inserted into the hole 13', and if necessary, the whole assembly is inserted into a jacket tube 19. The product is drawn to obtain the objective single-polarization single-mode optical fiber. |
